@Alexandre. Sorry by the late response. During this weekend I did some new tests, an, despite the cable seems to be OK in others appliances, I changed the RJ45 connector and the problem was solved....

Hi @Alexandre. The others maintain as Ethernet Backhaul.

@David-TP I’m having a similar issue. In my network topology, I have a Deco XE75 as main unit and 3 other units (2 XE75 and another PX50) connected to the main unit through a tp-link ls1008g switch....